Setting up render farm? GPU VERSUS CPU
It really depends on your scene. At the Blender Institute we render mostly on CPUs; when a GPU runs out of memory it'll crash, and when a CPU runs out of memory it'll swap. Things will get slow, but at least the render will finish at some point. Of course it also helps that we have a few very nice servers with CPU 40-80 cores each. If the RAM required to render the scene fits the GPU memory, things should be fine and it really depends on what kind of hardware you fit exactly.